CN115217665A

CN115217665A - Cylinder head and engine

Info

Publication number: CN115217665A
Application number: CN202210456299.6A
Authority: CN
Inventors: 丁泽华; 于鹏飞; 马京卫; 郭小虎
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2022-10-21
Anticipated expiration: 2042-04-27
Also published as: CN115217665B

Abstract

The invention provides a cylinder cover and an engine, wherein the cylinder cover comprises a cylinder cover main body and a timing cover integrally formed with the cylinder cover main body, a VVT solenoid valve mounting seat is formed on the timing cover, a VVT solenoid valve through hole is formed in the VVT solenoid valve mounting seat, and the top of the VVT solenoid valve mounting seat is provided with an arc-shaped middle sealing surface positioned in the middle and side sealing surfaces symmetrically arranged on two sides of the middle sealing surface. The lateral part sealing surface of each side all includes first sealed face and second sealed face, and the perpendicular line between the axis of first intersection line and the VVT solenoid valve via hole between first sealed face and the second sealed face satisfies with contained angle alpha between the timing cover top surface: alpha is less than or equal to 20 degrees. According to the cylinder cover, the timing cover cap and the VVT solenoid valve mounting seat are integrated on the cylinder cover, so that the number of parts can be effectively reduced, the weight of an engine can be reduced, and the oil leakage risk of the engine can be reduced by limiting the included angle alpha.

Description

Cylinder head and engine

Technical Field

The invention relates to the technical field of engines, in particular to a cylinder cover integrated with a timing cover and a VVT solenoid valve mounting seat. The invention also relates to an engine provided with the cylinder cover.

Background

In the prior art, the traditional engine cannot consider the optimal valve timing of Map at the same time, so that the performance of the engine is limited to a great extent, and the fuel economy and the dynamic property of the engine are sacrificed. The VVT (Variable Valve Timing) technology has solved the above problems to a great extent, and it adjusts the air intake amount by adjusting the throttle opening, so that the engine has ideal working conditions at different speeds.

With the continuous development of the VVT technology, the mid-set VVT technology is gradually applied, compared with the conventional VVT technology, the mid-set VVT system has a higher response degree, and because the oil control valve is installed inside the phaser rotor and is closer to the inner oil chamber of the phaser, the oil pressure loss in the oil passage is also smaller during operation. However, in the existing middle-set VVT technology, the VVT solenoid valve mounting seat is usually designed on the timing cover, and the timing cover is assembled with the cylinder head and the cylinder head cover, so that more parts are required, and the weight of the engine is not reduced.

In addition, the timing cover cap, the cylinder cover and the cylinder head cover are generally fastened by bolts, the joint surfaces are sealed by sealing rings and glued, and a T-shaped area is formed at the junction of the timing cover cap, the cylinder cover and the cylinder head cover after the timing cover cap, the cylinder cover and the cylinder head cover are assembled. At this time, since the T-shaped region is a joint portion between the timing cover, the cylinder head, and the cylinder head cover, manufacturing tolerance of relevant dimensions inevitably causes problems such as uneven mounting surface and local deformation of the seal ring at the joint portion, and the joint portion is often required to be coated with a sealant for secondary sealing. In addition, the part is also deformed and vibrated under the influence of thermal load, mechanical load and the like during the operation of the engine, so that the oil leakage risk is increased.

Disclosure of Invention

In view of the above, the present invention is directed to a cylinder head, so as to reduce the weight of an engine and reduce the risk of oil leakage of the engine.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the timing cover is positioned at one end of the cylinder cover main body, a VVT solenoid valve mounting seat is formed on the timing cover, and a VVT solenoid valve through hole is formed in the VVT solenoid valve mounting seat;

the top of the VVT electromagnetic valve mounting seat is provided with an arc-shaped middle sealing surface positioned in the middle and side sealing surfaces symmetrically arranged at two sides of the middle sealing surface, and the side sealing surface at each side comprises a first sealing surface connected with the middle sealing surface and a second sealing surface connected between the first sealing surface and the top surface of the timing cover;

the first sealing surface is a plane which is obliquely arranged, the second sealing surface is an arc surface, a first intersecting line M parallel to an axis O of the VVT solenoid valve through hole is arranged between the first sealing surface and the second sealing surface, and an included angle alpha between a vertical line between the first intersecting line M and the axis O and the top surface satisfies the following requirements: alpha is less than or equal to 20 degrees.

Further, a second intersection C parallel to the axis O is provided between the first sealing surface and the middle sealing surface, and an included angle β between a perpendicular between the second intersection C and the axis O and the top surface satisfies: alpha is more than beta and less than or equal to 60 degrees.

Further, in the width direction of the head body, the VVT solenoid valve mount is offset on the timing cover, and is disposed close to a boundary line B on the side of the head body, and a third intersection a is provided between the second seal surface and the top surface close to the side of the boundary line B, the third intersection a being parallel to the boundary line B, and a perpendicular distance L between the third intersection a and the boundary line B being satisfied: l is more than or equal to 15mm.

Furthermore, the timing cover cap is connected with the cylinder cover main body through side walls on two sides, the connecting position between each side wall and the cylinder cover main body is transited through a first fillet a, and the radius of the first fillet a is 5mm-10 mm.

Furthermore, be equipped with VVT solenoid valve mounting hole on the VVT solenoid valve mount pad, be equipped with the sealing washer mounting groove in the VVT solenoid valve via hole, just be equipped with respectively the both sides of VVT solenoid valve via hole VVT solenoid valve mounting hole.

Furthermore, a connecting line between centers of the VVT solenoid valve mounting holes on the two sides is parallel to the top surface, and in the direction of the connecting line between the centers of the VVT solenoid valve mounting holes on the two sides, perpendicular distances between the centers of the VVT solenoid valve mounting holes on the two sides and a center line Z of the VVT solenoid valve via hole are different.

Further, the included angle between the first sealing surface and the top surface is 30-60 degrees, and/or the curvature radius of the second sealing surface is 20-25 mm.

Furthermore, be equipped with on the timing cover with the exhaust cam bearing hole in the cylinder cap main part is just to the cam bearing hole processing groove of arranging, just cam bearing hole processing groove is the circular arc groove, cam bearing hole processing groove with the position that the top surface of timing cover links to each other passes through second fillet r transition.

Furthermore, a process through hole is formed in the outer wall of the timing cover cap, the process through hole is a blind hole, and a timing chain guide rail mounting hole penetrating to the inner side of the timing cover cap is formed in the bottom of the process through hole; and/or the timing cover cap and the cylinder cover main body are integrally cast and formed.

Compared with the prior art, the invention has the following advantages:

according to the cylinder cover, the timing cover cap formed with the VVT solenoid valve mounting seat is integrally formed with the cylinder cover main body, so that the timing cover cap and the VVT solenoid valve mounting seat are integrated on the cylinder cover, the number of parts can be effectively reduced, the weight of an engine can be reduced, a T-shaped area can be avoided, the problem of oil leakage of the T-shaped area can be avoided, and the risk of oil leakage of the engine can be reduced.

Meanwhile, each sealing surface is arranged at the top of the VVT solenoid valve mounting seat, the first sealing surface is a plane which is obliquely arranged, the second sealing surface is an arc surface, and a perpendicular line between a first intersection line between the first sealing surface and the second sealing surface and the axis of the VVT solenoid valve through hole is arranged, so that the included angle alpha between the perpendicular line and the top surface of the timing cover is not more than 20 degrees. Therefore, smooth transition between sealing surfaces can be realized, the surface pressure of the sealing ring of the cylinder head cover can be increased favorably when the cylinder head is connected with the cylinder head cover, and the sealing reliability of the VVT electromagnetic valve mounting seat is improved.

And set up VVT solenoid valve via hole on the VVT solenoid valve mount pad, then can make the VVT solenoid valve mount pad be monolithic structure to compare in current split type structure, can promote integrating of spare part.

In addition, in the invention, the arrangement of the included angle beta between the perpendicular line between the second intersection line and the VVT solenoid valve via hole axis and the top surface and the arrangement of the perpendicular line distance L between the third intersection line and the boundary line can ensure that the sealing surfaces are in smooth transition, and simultaneously, the invention is beneficial to further increasing the surface pressure of the cylinder head cover sealing ring and improving the sealing reliability of the VVT solenoid valve mounting seat. And the arrangement of a transition fillet between the side wall and the cylinder cover main body can ensure the structural strength and rigidity of the timing cover cap. The setting of sealing washer mounting groove, then usable sealing washer guarantees the isolation between intracavity and the external world in right time, guarantees the leakproofness of cover inner space in right time.

In addition, according to the invention, the perpendicular distances between the centers of the VVT electromagnetic valve mounting holes on the two sides and the center line of the VVT electromagnetic valve through hole are different, so that the mounting angle of the electromagnetic valve is unique, and the plug of the VVT electromagnetic valve can face the bottom surface direction of the cylinder cover, thereby saving the VVT mounting space and being beneficial to the arrangement of engine wiring harnesses.

The arrangement of the included angle between the first sealing surface and the top surface is favorable for realizing the compression between the sealing ring of the cylinder head cover and the cylinder head and also favorable for the arrangement of the cylinder head cover and the width direction of the cylinder head cover. The curvature radius of the second sealing surface is arranged, so that the second sealing surface is tightly attached to a sealing ring of a cylinder head cover on one hand, and the stability of a machining tool and the surface machining quality of the sealing surface are improved on the other hand. The arrangement of the cam bearing hole processing groove is beneficial to the processing and forming of the exhaust cam bearing hole, and the arrangement of the process through hole is also convenient for the processing of the mounting hole of the timing chain guide rail and the assembly of the timing chain guide rail.

Another object of the invention is to propose an engine in which a cylinder head as described above is provided.

By adopting the cylinder cover, the number of parts can be effectively reduced, the weight of the engine can be reduced, and the oil leakage risk of the engine can be reduced, so that the engine is more attractive in appearance and has good practicability.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of a partial structure of a cylinder head according to a first embodiment of the present invention;

FIG. 2 is a front view of the structure shown in FIG. 1;

FIG. 3 is an isometric view of the structure shown in FIG. 2;

description of reference numerals:

1. a cylinder head main body;

2. a timing cover; 201. a side wall; 202. a top surface;

3. a VVT solenoid valve mounting base; 301. a VVT solenoid valve via hole; 302. a sealing ring mounting groove; 303. a protruding portion; 304. a VVT solenoid valve through hole; 305. a middle seal face; 306. a side sealing surface; 3061. a first sealing surface; 3062. a second sealing surface;

4. an exhaust cam bearing bore;

5. machining a groove in a cam bearing hole;

6. a process via hole;

7. a timing chain guide mounting hole;

a. a first rounded corner; r, a second fillet; A. a third intersection line; B. a boundary line; C. a second intersection line; m, a first intersection line; z, the center line; o, axis.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection may be fixed, detachable, or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example one

The embodiment relates to a cylinder head, which is beneficial to reducing the number of parts of an engine, reducing the weight of the engine and reducing the oil leakage risk of the engine.

As shown in fig. 1 to 3, the cylinder head includes, in a unitary structure, a head main body 1, and a timing cover 2 integrally formed with the head main body 1, the timing cover 2 being located at one end of the head main body 1, and a VVT solenoid valve mount 3 also being formed on the timing cover 2.

In a preferred embodiment, the timing cover 2 may be integrally cast with the head main body 1, and the VVT solenoid valve mount 3 is integrally formed with the timing cover 2 during the casting. At the moment, the casting molding process is adopted, so that the cylinder cover can be conveniently manufactured, and the cylinder cover has the advantages of low cost, easiness in ensuring the product quality and the like. However, instead of molding by casting, the cylinder head integrated with the timing cover 2 may be integrally molded by, for example, machining.

In the present embodiment, a timing chamber is formed inside the timing cover 2 to accommodate the timing system components, and the shape of the timing cover 2 may be designed to follow the timing system components formed in the timing chamber. Meanwhile, when the timing system component is disposed in the timing chamber, the safety clearance between the timing cover 2 and the timing system component may be set to be generally 5mm.

In order to ensure good casting manufacturability, the basic wall thickness of the timing cover 2, that is, the wall thickness of most positions of the timing cover 2, can be set to be 4.5mm, and the wall thickness can maximally achieve light weight design on the basis of ensuring the installation and operation of components of the timing system, so that the overall volume of the cylinder cover is smaller, and convenience is provided for the whole engine. Of course, the timing cover 2 is also typically thickened or thinned locally, depending on the specific design requirements, so that the wall thickness at this location is greater than 4.5mm, or less than 4.5 mm.

Still as shown in fig. 1, in a specific structure, the timing cover 2 is connected to the cylinder head main body 1 through the side walls 201 on both sides, and as a preferred embodiment, the connection position between each side wall 201 and the cylinder head main body 1 is also transited through a first fillet a, and the radius of the first fillet a can be set between 5mm and 10mm, so that the position has a suitable wall thickness, thereby ensuring the structural strength and rigidity of the timing cover 2, ensuring the reliability of the connection between the timing cover 2 and the cylinder head main body 1, and achieving the effect of improving the overall structural stability of the integrally formed cylinder head.

In specific implementation, the radius of the first rounded corner a may be 5mm, 6mm, 8mm, or 10mm, for example.

In addition, as shown in fig. 1 and 2, in the present embodiment, the VVT solenoid valve mount 3 is disposed near one side of the timing cover 2, and a VVT solenoid valve through hole 301 and a VVT solenoid valve mount hole 304 are provided in the VVT solenoid valve mount 3. This setting of VVT solenoid valve via hole 301 for fashioned VVT solenoid valve mount pad 3 is monolithic structure on the shroud 2 in right time, and it compares in current split type structure, also is that VVT solenoid valve mount pad 3 is half on the shroud in right time, and half is covered at the cylinder head, can further promote integrating of spare part, in order to do benefit to subtract heavy and improve the assembly convenience.

In order to isolate the timing cavity from the outside and ensure the sealing reliability of the timing cover 2, a sealing ring mounting groove 302 is also arranged in the VVT solenoid valve via hole 301, and VVT solenoid valve mounting holes 304 are respectively arranged on two sides of the VVT solenoid valve via hole 301 to realize the reliable mounting of the VVT solenoid valve. The VVT solenoid valve mounting holes 304 are specifically located at the protruding portion 303 of the side portion of the VVT solenoid valve mounting seat 3, and each VVT solenoid valve mounting hole 304 generally adopts a threaded hole, and when the VVT solenoid valve is mounted, the VVT solenoid valve is mounted and fixed by a bolt screwed into the VVT solenoid valve mounting hole 304.

At this time, the protruding portion 303 is arranged to form the VVT solenoid valve mounting hole 304, so that the arrangement of the VVT solenoid valve mounting hole 304 is facilitated, and the structural strength of the position of the VVT solenoid valve mounting hole 304 can be ensured, thereby improving the stability of the VVT solenoid valve mounting. The installation and fixation of the VVT electromagnetic valve are carried out by utilizing the bolt, and the connection is reliable, the operation is convenient, the cost is low, and the later-stage VVT electromagnetic valve maintenance and repair are facilitated.

In addition, it is preferable that only one VVT solenoid mounting hole 304 may be provided on both sides of the VVT solenoid passing hole 301. Further, it is also preferable that a line connecting centers of the VVT solenoid valve mounting holes 304 on both sides of the VVT solenoid valve passing hole 301 be provided parallel to the top surface 202 of the timing cover 2. As such, referring to fig. 2, the connection line between the centers of the VVT solenoid mounting holes 304 on both sides is arranged in the horizontal direction, and in practical implementation, the center of each VVT solenoid mounting hole 304 may also be generally designed to pass through the top end surface of the cylinder head, so as to facilitate the arrangement of the VVT solenoid.

In the present embodiment, as a preferred embodiment, the perpendicular distances between the centers of the VVT solenoid mounting holes 304 on both sides and the center line Z of the VVT solenoid through hole 301 may be set to be different in the direction of the line connecting the centers of the VVT solenoid mounting holes 304 on both sides, that is, in the horizontal direction. Specifically, as also shown in FIG. 2, it is also known that the perpendicular distance w is different from the perpendicular distance n.

At this time, the distances between the VVT solenoid valve mounting holes 304 on both sides and the center line L of the VVT solenoid valve via hole 301 are different, so that the solenoid valve mounting angle is unique, and the plug of the VVT solenoid valve is directed toward the cylinder head bottom surface during specific implementation, so as to save the mounting space of the variable valve timing system and facilitate the arrangement of an engine harness.

In this embodiment, when the VVT solenoid valve is installed, the VVT solenoid valve is in transmission connection with other components in the VVT structure through the VVT solenoid valve via hole 301. Meanwhile, the O-shaped sealing ring of the VVT solenoid valve is also disposed in the sealing ring mounting groove 302, and plays a role in sealing as needed along with the fixation of the VVT solenoid valve.

When the valve seat is assembled with the cylinder head cover, the top of the VVT solenoid valve mounting seat 3 is used as a joint surface and abuts against the cylinder head cover. Therefore, in the present embodiment, the top of the VVT solenoid valve mount 3 has a middle sealing surface 305 in the middle, which is arc-shaped, and side sealing surfaces 306 symmetrically disposed on both sides of the middle sealing surface 305. The widths of the middle sealing surface 305 and the side sealing surfaces 306 can be generally set to be 5mm-6mm, so that a large contact area is formed between the top of the VVT solenoid valve mounting seat 3 and a cylinder head cover sealing ring when the VVT solenoid valve mounting seat is connected with a cylinder head cover, and sealing requirements are met. Further, in implementations where the width of the mid seal surface 305 and the side seal surface 306 may be, for example, 5mm, 5.5mm, or 6mm, the arcuate mid seal surface 305 may generally be sized according to the diameter of the VVT solenoid valve.

Furthermore, in a preferred embodiment, each lateral sealing surface 306 comprises a first sealing surface 3061 connected to the central sealing surface 305 and a second sealing surface 3062 connected between the first sealing surface 3061 and the top surface 202 of the timing cover 2. The top surface 202 is a top end surface of the cylinder head, and in the present embodiment, the first sealing surface 3061 is embodied as a plane surface arranged obliquely, and the second sealing surface 3062 is embodied as a cambered surface, so that a smooth transition connection between the top surface 202 and the first sealing surface 3061 can be formed via the second sealing surface 3062.

In the specific design of the sealing surfaces, as also shown in fig. 1 and 2, the present embodiment has a first intersection M parallel to the axis O of the VVT solenoid valve via 301 between the first sealing surface 3061 and the second sealing surface 3062 on both sides, and a second intersection C parallel to the axis O between the first sealing surface 3061 and the middle sealing surface 305. Note that, in fig. 1 and 2, for clarity of the respective portions in the drawings, only the first intersecting line M and the second intersecting line C on one side are illustrated.

With continued reference to fig. 2, the present embodiment also makes an included angle α between a perpendicular line between the first intersection line M and the axis O of the VVT solenoid valve via hole 301 and the top surface 202 satisfy: alpha is less than or equal to 20 degrees. And the angle β between the perpendicular between the second intersection line C and the axis O and the top surface 202 satisfies: alpha is more than beta and less than or equal to 60 degrees. Through the limited to contained angle alpha and contained angle beta angle, this embodiment not only can be so that smooth transition between each sealed face, also can be favorable to increasing the face pressure of cylinder head cover sealing washer when cylinder head and cylinder head cover are connected simultaneously, and then improve the reliability that VVT solenoid valve mount pad 3 department is sealed.

In specific implementation, the included angle β may be, for example, 50 °, 52 °, 55 °, 58 °, 60 °, or the like, and the included angle α may be, for example, 15 °, 16 °, 18 °, 20 °, or the like.

In the present embodiment, as shown in fig. 1 and 2 as well, the VVT solenoid valve mount 3 is also offset on the timing cover 2 in the width direction of the head main body 1, and is disposed close to the boundary line B on the side of the head main body 1. Further, the second sealing surface 3062 on the side close to the boundary line B has a third intersection a between the second sealing surface 3062 and the top surface 202, the third intersection a being parallel to the boundary line B, and a perpendicular distance L between the third intersection a and the boundary line B being such that: l is more than or equal to 15mm.

Through prescribing a limit to perpendicular distance L between third intersection line A and boundary line B, this embodiment cooperates in foretell to the injecing of contained angle alpha and contained angle beta angle, can further do benefit to the face pressure that increases the cylinder head cover sealing washer when cylinder head and cylinder head cover are connected, and reaches the effect that promotes VVT solenoid valve mount pad 3 department sealing reliability. In particular, the perpendicular distance L may be, for example, 15mm, 16mm, 18mm or 20 mm.

In this embodiment, for the above obliquely arranged first sealing surface 3061, it may be preferred to provide the included angle between the first sealing surface 3061 and the top surface 202 between 30 ° and 60 °. In the range, the compression between the sealing ring of the cylinder head cover and the cylinder cover is favorably realized, and the arrangement of the cylinder cover and the width direction of the cylinder head cover is also favorably realized. In specific implementation, the optimal included angle may be 45 °, and it should be noted that the larger the included angle is, the more unfavorable the compression between the cylinder head cover sealing ring and the cylinder head is, and the smaller the included angle is, the more unfavorable the arrangement in the width direction of the cylinder head cover and the cylinder head cover is.

In this embodiment, the radius of curvature of the second sealing surface 3062 can be set between 20mm and 25 mm. In this scope, on the one hand be favorable to with the cylinder head cover sealing washer closely laminating, on the other hand it also is favorable to increasing the processing cutter arbor diameter of carrying out sealed face processing, improves the stability of cutter arbor rigidity and cutter, also does benefit to the surface finish quality who promotes sealed face simultaneously. In one embodiment, the radius of curvature of the second sealing surface 3062 can be 20mm, 22mm, or 25mm, for example.

To facilitate the machining of the exhaust cam bearing hole 4, as shown in fig. 1 and 2, the timing cover 2 of the present embodiment is also provided with a cam bearing hole machining groove 5 disposed opposite to the exhaust cam bearing hole 4 in the cylinder head main body 1. The cam bearing hole processing groove 5 is specifically positioned at the top of the timing cover 2, and the cam bearing hole processing groove 5 is also an arc groove. In order to avoid the generation of sharp corner structure to affect the sealing effect, the embodiment further causes the connection part of the cam bearing hole processing groove 5 and the top surface 202 of the timing cover 2 to transit through the second round corner r. During the concrete implementation, this second fillet r's radius can be 5mm for example to not only can satisfy the setting needs of second fillet r, also can avoid bringing too much machining work load simultaneously.

In this embodiment, as shown in fig. 3, a process through hole 6 is further formed in the outer wall of the timing cover 2, the process 6 is a blind hole, and a timing chain guide mounting hole 7 penetrating to the inner side of the timing cover 2, that is, penetrating into the timing cavity is also formed in the bottom of the process through hole 6. At the moment, the timing chain guide mounting hole 7 is used for mounting the timing chain guide in the timing cavity, and the process through hole 6 is convenient for processing the timing chain guide mounting hole 7 and assembling the timing chain guide mounting bolt. In practice, the diameter of the process via 6 may be generally determined by the diameter of the flange of the timing chain guide mounting bolt, and it may be generally set to not less than 18mm.

The timing cover 2 and the cylinder head main body 1 of the cylinder head are integrally formed through the VVT electromagnetic valve mounting seat 3, so that the timing cover 2 and the VVT electromagnetic valve mounting seat 3 are integrated on the cylinder head, the number of parts can be effectively reduced, the appearance of an engine can be improved, and the weight of the engine can be reduced. Meanwhile, the T-shaped area can be avoided, the oil leakage problem of the T-shaped area is avoided, and therefore the arrangement of sealing surfaces at the VVT electromagnetic valve mounting seat 3 can be matched, the oil leakage risk of an engine is reduced, and the practicability is good.

Example two

The present embodiment relates to an engine provided with a cylinder head as described above.

The engine of the embodiment can effectively reduce the number of parts and the weight of the engine by adopting the cylinder cover, can also reduce the oil leakage risk of the engine, and has good practicability.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A cylinder head, characterized in that:

the timing cover comprises a cylinder cover main body (1) and a timing cover cap (2) which is integrally formed with the cylinder cover main body (1), wherein the timing cover cap (2) is positioned at one end of the cylinder cover main body (1), a VVT (variable valve timing) electromagnetic valve mounting seat (3) is formed on the timing cover cap (2), and a VVT electromagnetic valve through hole (301) is formed in the VVT electromagnetic valve mounting seat (3);

the top of the VVT solenoid valve mounting seat (3) is provided with a middle sealing surface (305) which is positioned in the middle and is in an arc shape, and side sealing surfaces (306) which are symmetrically arranged at two sides of the middle sealing surface (305), wherein the side sealing surface (306) at each side comprises a first sealing surface (3061) connected with the middle sealing surface (305) and a second sealing surface (3062) connected between the first sealing surface (3061) and the top surface (202) of the timing cover (2);

the first sealing surface (3061) is a plane which is obliquely arranged, the second sealing surface (3062) is a cambered surface, a first intersection line (M) which is parallel to an axis (O) of the VVT solenoid valve through hole (301) is arranged between the first sealing surface (3061) and the second sealing surface (3062), and an included angle alpha between a perpendicular line between the first intersection line (M) and the axis (O) and the top surface (202) satisfies that: alpha is less than or equal to 20 degrees.

2. The cylinder head of claim 1, wherein:

a second intersection (C) parallel to the axis (O) is provided between the first sealing surface (3061) and the mid-seal surface (305), and an angle β between a perpendicular between the second intersection (C) and the axis (O) and the top surface (202) is such that: alpha is more than beta and less than or equal to 60 degrees.

3. The cylinder head of claim 1, wherein:

in the width direction of the cylinder head body (1), the VVT solenoid valve mounting seat (3) is offset on the timing cover (2) and is arranged close to a boundary line (B) on one side of the cylinder head body (1), and a third intersection line (A) is arranged between the second sealing surface (3062) and the top surface (202) on one side close to the boundary line (B), the third intersection line (A) is parallel to the boundary line (B), and a perpendicular distance L between the third intersection line (A) and the boundary line (B) satisfies: l is more than or equal to 15mm.

4. The cylinder head of claim 1, wherein:

the timing cover cap (2) is connected with the cylinder cover main body (1) through side walls (201) on two sides, the connecting positions of the side walls (201) and the cylinder cover main body (1) are transited through first fillets (a), and the radius of the first fillets (a) is 5mm-10 mm.

5. The cylinder head of claim 1, wherein:

be equipped with VVT solenoid valve mounting hole (304) on VVT solenoid valve mount pad (3), be equipped with sealing washer mounting groove (302) in VVT solenoid valve via hole (301), just be equipped with respectively in the both sides of VVT solenoid valve via hole (301) VVT solenoid valve mounting hole (304).

6. The cylinder head of claim 5, wherein:

the connecting line between the centers of the VVT solenoid valve mounting holes (304) on the two sides is parallel to the top surface (202), and in the connecting line direction of the centers of the VVT solenoid valve mounting holes (304) on the two sides, the perpendicular distance between the centers of the VVT solenoid valve mounting holes (304) on the two sides and the center line (Z) of the VVT solenoid valve through hole (301) is different.

7. The cylinder head of claim 1, wherein:

the angle between the first sealing surface (3061) and the top surface (202) is between 30 ° and 60 ° and/or the radius of curvature of the second sealing surface (3062) is between 20mm and 25 mm.

8. The cylinder head of claim 1, wherein:

be equipped with on timing shroud (2) with exhaust cam bearing hole (4) in cylinder cap main part (1) just to cam bearing hole processing groove (5) of arranging, just cam bearing hole processing groove (5) are the circular arc groove, cam bearing hole processing groove (5) with the position that top surface (202) of timing shroud (2) link to each other passes through second fillet (r) transition.

9. The cylinder head according to any one of claims 1 to 8, wherein:

a process through hole (6) is formed in the outer wall of the timing cover cap (2), the process through hole (6) is a blind hole, and a timing chain guide rail mounting hole (7) penetrating to the inner side of the timing cover cap (2) is formed in the bottom of the process through hole (6); and/or the presence of a gas in the atmosphere,

the timing cover cap (2) and the cylinder cover main body (1) are integrally cast and formed.

10. An engine, characterized in that:

the engine is provided with the cylinder head according to any one of claims 1 to 9.